Supplement to the Magnetical Instructions for the Use of Portable Instrumensts, &c,.

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The observations required may be made in the open air and completed, in clear
and favourable weather, in about three ... the instrument without twisting the
suspension thread. average of thirty or forty minutes ; and for the between each
seriesanbsp;...

Title

:

Supplement to the Magnetical Instructions for the Use of Portable Instrumensts, &c,.

Author

:

Charles James Buchanan Riddell

Publisher

:

- 1844

ISBN-13

:

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